Question I (20 marks)\ a) State whether the following statements are true (T) or false (F) (1 mark each)\ i. The structure of the earth is quite complex, with a molten core, a semi-liquid mantle, and a solid non moveable crust\ ii. The oceanic crust is found under the sea and is thicker and denser than the continental crust\ iii. The rocks of the continental crust are very young compared with most of the rocks of the oceanic crust.\ iv. Plates of lithosphere are moved around by the underlying hot inner core convection cells\ v. Petrophysicists are only interested in the crust, where oil and gas and minerals can be found.\ vi. Spalling failure occurs with the uniaxial compressive loading.\ b) Define the following geological/rock-mechanical terms that are often used in the field of rock mechanics,\ i. Minerals (I mark)\ ii. Rocks (l mark)\ iii. Rock mass (I mark)\ c) Differentiate between the following terms\ i. Joints and faults (3 marks)\ ii. Abyssal and hypabyssal rocks (3 marks)\ d) Define the term Rock Quality Designation (RQD) for the drill core and based on the definition classify the rock given in Figure 1 (5 marks)\ Table 1: Rock mass quality\ Toal iengh ct core run

=2.8m

\ \\\\table[[RQD (%),Rock Mass Quality],[25,Very poor],[

25-50

,Poor],[

50-75

,Fair],[

75-90

,Good],[

90-100

,Excellent]]\ Figure 1: Shows the rock core recovery for RQD and Table 1 represents the rock mass quality

a) State whether the following statements are true (T) or false (F) (1 mark each) i. The structure of the earth is quite complex, with a molten core, a semi-liquid mantle, and a solid non moveable crust ii. The oceanic crust is found under the sea and is thicker and denser than the continental crust iii. The rocks of the continental crust are very young compared with most of the rocks of the oceanic crust. iv. Plates of lithosphere are moved around by the underlying hot inner core convection cells v. Petrophysicists are only interested in the crust, where oil and gas and minerals can be found. vi. Spalling failure occurs with the uniaxial compressive loading. b) Define the following geological/rock-mechanical terms that are often used in the field of rock mechanics. i. Minerals (1 mark) ii. Rocks (l mark) iii. Rock mass (l mark) c) Differentiate between the following terms i. Joints and faults (3 marks) ii. Abyssal and hypabyssal rocks (3 marks) d) Define the term Rock Quality Designation (RQD) for the drill core and based on the definition classify the rock given in Figure 1 (5 marks) Table 1: Rock mass quality Figure 1: Shows the rock core recovery for RQD and Table 1 represents the rock mass quality